build!: moving to c8 for coverage and dropping Node 6 from build matr…

…ix (yargs#209)

.travis.yml

@@ -3,8 +3,15 @@ os:
   - linux
   - windows
 node_js:
-  - "6"
   - "8"
   - "10"
-  - "node"
-after_script: npm run coverage
+  - "12"
+  - "13"
+
+jobs:
+  include:
+    - stage: coverage
+      node_js: "13"
+      script:
+        - npm t
+        - npm run coverage

package.json

@@ -4,9 +4,9 @@
   "description": "the mighty option parser used by yargs",
   "main": "index.js",
   "scripts": {
-    "test": "nyc mocha test/*.js",
+    "test": "c8 --reporter=text --reporter=html  mocha test/*.js",
     "posttest": "standard",
-    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "coverage": "c8 report --reporter=text-lcov | coveralls",
     "release": "standard-version"
   },
   "repository": {
@@ -26,10 +26,10 @@
   "author": "Ben Coe <ben@npmjs.com>",
   "license": "ISC",
   "devDependencies": {
+    "c8": "^6.0.0",
     "chai": "^4.2.0",
     "coveralls": "^3.0.2",
     "mocha": "^5.2.0",
-    "nyc": "^14.1.0",
     "standard": "^12.0.1",
     "standard-version": "^6.0.0"
   },